Vacuum-pump.



L. BULL.

VACUUM PUMP.- APPLICATION FILED SEPT-10.19M-

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Patented June 11, 1918.

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VACUUM PUMP. APPLIQATION FILED SEPT- 10. 1917.

1,969,376. Patented J 11116 11, 1918.

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LIONEL BULL, or LIBERT'YVILLE, ILLINOIS, ASSIGNOROF ONE-HALF To GEORGE E. LINN, or CHICAGO, ILLnvoIs.

VACUUM-PUMP.

Applioationfiled September 10. 1917.

To all whom it may concern .1

Be it known that I, LIONEL BULL, a subject of the King of Great Britain and Ireland, and resident ofLibertyville, county or Lake, and State of Illinois, have. invented certain new and useful Improvements in Vacuu1n-Pumps, of which the following is a specification, and which are illustrated in the accompanying drawings, forming a part thereof.

The invention. relates to air pumps and more especially to. a pump which is designed to createand maitnain. a substantialvacuum. The object of the invention is to provide an efficient vacuum pump for use in connection with milking machines and the like, wherein simplicity of construction. and reliability in operation with but a relatively small consumption of power are desirable. To this end the invention contemplates improvements in vacuum pumps of the type comprising a cylinder and reciprocating pision, the improvements residing more especially in an arrangement of automatic valves whereby simplicity of construction and a minimum amount of clearance are secured.

In the accompanying drawings:

Figure 1 is a detail plan view showing the cylinder, piston rod and a part of the pitman of a vacuum pump embodying the features of improvement provided by the invention,

Fig. 2 is a side elevation, showing the entire pump, and

Figs. 3 and 4 are longitudinal vertical sectional views taken on the lines 33 and 4-4 respectively, of Fig. 1..

The drawings illustrate a cylinder 10 and double acting piston 11. The cylinder 10 has removable heads12 and 13, one of which, as 12, is formed with a gland 14, through which the piston rod 15 operates. The other cylinder head 13 is centrally provided with a socket 16 upon the inside to receive the clamp nut 17 by which the piston 11 is secured upon the end of the piston rod 15. The strokes of the piston 11 are thus permitted to extend throughout the full length of the cylinder 10.

For the purpose of securing an eflicient construction with but a small number of parts the Wall of the cylinder 10 is formed with a boss 25 at one side and this boss is cored to provide intake and exhaust passages 18, 19. Similarly, the cylinder heads Specification of Letters Patent.

Patented June 11, 1313..

Serial No. 190,573.

12 and 13 are each tormedwith a boss 26 at one side and this boss is cored to provide a valve chamber 20. The intake and exha ust passages 18, 19 extend throughout the length of the cylinder between the heads 12 and 13. They have lateral ports 21 and 22 for connection respectively with the vacuum line 23 and an exhaust pipe 24.

Each valve chamber 20 extends vertically through the corresponding boss 26 and is formed with two upwardly facing valve seats 27 and 28 of different sizes, the ends of the valve chamber being closed by removable caps 37 and 38. These valve seats are located intermediate the ends of the valve chamber and the corresponding cylinder head 12 or 13 is formed with a port 29 (Fig. 4) which connects the space between the valve seats with the chamber of the cylinder. The cylinder heads 12 and 13 are each also formed with ports 31 and 32 (Fig. 3). The port 31 connects the space below the valve seat 27 with the corresponding end of the intake passage. The port 32 connect the space above the valve seat 28 with the corresponding end of the exhaust passage 19.

Valves 33 and 34 coiiperate with the valve seats 27 and 28 respectively of each seat. Preferably these valves have a vertical movement and they are normally closed by gravity. The valve 33 is guided by being formed with a grooved stem 35 which has a sliding fit in the valve chamber 20 below the valve seat 27. The valve 34 has an upwardly projecting stem 36. This valve stem slidingly enters a socket 39 which is formed in the corresponding cap 38. To insure an efficient operation of the valve, the valve 33 is ground to make a close fit upon the valve seat 27 while the valve 34 has a fiber facing 40 for engaging the valve seat 28. In the arrangement shown each cap 37 takes the form of a screw plug which is entered in the lower end of the corresponding valve chamber 20. On the other hand, the upper end of the valve chamber 20 is preferably made of sufiicient size to permit the removal of both of the valves 33 and 34, through the top of the chamber upon removal of the corresponding cap 38. Each cap 38 is accordingly seated upon the top of the corresponding boss 26 over the open end of the valve chamber 20. A yoke 41 and clamping screw 42 conveniently serve for removably holding each cap 38 to its seat. As shown, the inturned lower ends of each yoke 41 are engaged beneath ears 43, one of which is provided at each side of the corresponding boss 26, at its upper end. Any convenient mechanism may be employed for reciprocating the piston 11, but preferably this mechanism will be such as to insure a straight line movement of the piston rod 15 through the gland 14. As shown, a standard 44 is employed for providing a sliding support for the piston rod 15 adjacent its outer end. This standard 44 and the cylinder 10 are preferably mount ed upon a common base as 45. The base 45 also serves for supporting a crank shaft 46 beyond the outer end of the piston rod 15. A pitman 47 connects the crank shaft 46 with the piston rod 15. As the point of attachment of the pitman 47 with the piston rod 15 is preferably located between the gland 14 and the standard 44 the pitman 47 is bifurcated to clear the standard 44 and the outer end of the piston rod.

I claim as my invention:

In a vacuum pump in combination, a hori zontal cylinder having an integral side wall formed at one side with intake and exhaust passages extending longitudinally through the same from end to end, at different levels, heads removably applied to the ends of the cylinder, each head being formed with an outstanding integral upright chambered boss, located at one side of the axis of the cylinder and having its chamber located beyond the plane of the outer surface of the remainder of the head, and with three ports communicating with the chamber of the boss at different levels, the intermediate port also communicating with the chamber of the cylinder and the upper and lower ports registering respectively with the said exhaust and intake passages, an upwardly opening intake valve operating in the chamber of each cylinder head between the lower and intermediate ports and an upwardly opening exhaust valve operating in the chamber of each cylinder head between the intermediate and upper ports.

LIONEL BULL.

Copies of this patent may be obtained for five cents each, by addressing thev Commissioner of Patents,

Washington, D. G. 

